Oil enters a horizontal rotating tube through a radially-attached duct at one end. The tubewith the other end closed is attached with radial twin exit branches permitting oil to exit intoopen air. Air begins to enter through one of the two branches into the tube when its rotationalspeed reaches certain critical values. An experimental study is performed to investigate thisair-oil two-phase flow behavior. Both the tube and the branches are transparent to allowillumination and flow visualization during spin-up and spin-down processes. The branch-totubediameter ratio, rotational speed, and oil flow rate are varied. Changes in oil flow ratesare measured as a function of rotational speed. A comparison is made between cases of avarying total oil flow rate due to rotation effects and a constant one under control. It isdisclosed that cavitation in oil flow is induced by air entering the branches opposite to theejecting oil flow. Subsequently air bubbles progress in the tube. The origin of this intrusiondepends on the hydraulic head loss of the piping system. This study can be applied to oillubrication analysis of rotating machinery, such as automotive transmission lines.

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